Sculpting Dynamic topology or detail flood fill?
There is a change from the 2.7x sculpting workflow to 2.8

You can still use dynamic topology but it's not the recommended workflow anymore.

The new workflow is sculpting on the static mesh and remeshing.

Pablo Dobarros Talk about the new tools and how they work:
https://www.youtube.com/watch?v=lxkyA4Xslzs

Hand on with Julien Kasper using the 2.8 workflow:
https://www.youtube.com/watch?v=YaVEJTLDD3Y